Well, I'm flummoxed. Your python script works exactly as I described, but I apparently didn't account for some other dynamic that I can't seem to figure out. There's probably a mathematical way to describe it, but basically there needs to be some calculation/adjustment to the bend and twist of the forearm at the same time to compensate for the side-side going to zero. I worked with it for a while to no avail so far, but I'll work at it some more. It's all math, right? So there has to be some logic to it...

Thanks again--Tim